Clark Fork is a city in Bonner County, Idaho. The population was 536 at the 2010 census.
Clark Fork is located at 48°8′50″N 116°10′42″W (48.147180, -116.178270), at an elevation of 2,090 feet (637 m) above sea level. According to the United States Census Bureau, the city has a total area of 0.92 square miles (2.38 km2), all of it land.
This climatic region is typified by large seasonal temperature differences, with warm to hot (and often humid) summers and cold (sometimes severely cold) winters. According to the Köppen Climate Classification system, Clark Fork has a humid continental climate, abbreviated "Dfb" on climate maps.
As of the census of 2010, there were 536 people, 260 households, and 138 families living in the city. The population density was 582.6 inhabitants per square mile (224.9/km2). There were 308 housing units at an average density of 334.8 per square mile (129.3/km2). The racial makeup of the city was 95.5% White, 0.7% Native American, 0.6% Asian, 0.6% from other races, and 2.6% from two or more races. Hispanic or Latino of any race were 0.9% of the population.
There were 260 households, of which 24.6% had children under the age of 18 living with them, 40.4% were married couples living together, 7.7% had a female householder with no husband present, 5.0% had a male householder with no wife present, and 46.9% were non-families.